Peristalsis

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Revision as of 11:42, 29 November 2013

This is the movement of circular and longitudinal muscles within some organs. Peristalsis can be seen making a wavelike pattern, extending hollow tubes of organs, to move objects in or out of the system. It mainly occurs in the stomach, intestines and esophagus[1]. However, in some organisms, instead of moving a bolus of food, peristaltic wave motion may propel an entire organism. This is the case for earthworms[2].

Peristalsis is under the influence of the autonomic nervous system and so is involuntary. Depending on the purpose and location, there can be two types of peristaltic waves. One can be a short, local reflex or a long, continuous contraction that spans the entire length of an organ[3].


References:

  1. (n.d.). Peristalsis. [Online], Available: http://www.britannica.com/EBchecked/topic/452053/peristalsis. Last accessed 29/11/13.
  2. (n.d.). Earthworm - Muscular System [Online], Available: http://www.angelfire.com/de2/atoy/mus.htm. Last accessed 29/11/13.
  3. (n.d.). Peristalsis. [Online], Available: http://www.britannica.com/EBchecked/topic/452053/peristalsis. Last accessed 29/11/13.

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